Projectile provided with windshield



@Qfi 27, 1931. J cox ET AL 1,829,212

PROJECTILE PROVIDED WITI'I WINDSHIELD Filed Oct. 11, 1950 Patented ct. 27, 1931 width? I 7 JOHN L. AND Brennan arm; or PHILADELPHIA, rnnNsYnvAN-m P1303 ECTILE PROVIDED WITH WINDSHIELD Application filed October 11, 1930; Serial No. 488,035.

This invention relates to a projectileprovlded with a windshield. I

It has been customary to provide projec to the projectiles proper. It is founddesir-j able that the wlndshield be of very lightv conlc'struction, and a suitable type of windshield may be made of drawn steel. However, although 1t 1s easy to removably secureto a pro ectile a machined casting or forg1ng,-1t

is difficult to reinovably secure to a proj ectile a drawn steel Windshield due to the fact that the wallsare relatively thin and ofsubstantially uniform thickness.

In order to so secure to a projectile a windshield of drawn steel as to insure against displacement of the windshield durirhg handling,

of the projectile or during its ght, it is known (see Cox and Fine Patent No. 1,760,- 685) to permanently secure to the rear end of the windshield a ring having aninterior thread engaging an exterior thread on the projectile and which abuts against a circumferential. forwardly facing. shoulder on the projectile.

Our present invention is a specific embodi- 3o ment of the said Cox and Fine invention, but

is an improvement thereover in that the rear end of the windshield proper, as well as the rear end of the permanently secured ring, abuts against the oircuinferentially forwardly facing shoulder on the projectile. It also has been found advantageous to further modify the prior construction by providing on the projectile a circumferential shoulder which extends from its periphery in a rearwardly inclined direction and by shaping the concentric end walls of windshield and ring to fit such shoulder so that in effect the outer edge of the shoulder will overhang the rear ends of the windshield and ring. It also has been found advantageous to have the ring gradually increase in thickness from front to rear for purposes hereinafter explained.

In the drawings:

Fig. 1 is a sectional View showing the windshield applied to the point of "a capped. shell (service projectile); I 1 c ig. 2 is anenlargedldetail of Fig}. l} Fig. 3'is a viewshowingthewindshieldap plied directly tothe point'of aishell'body unprovided with a cap (target projectile).

A projectile having a body a is provided with a cap Z) ofany desired type, which may be secured to the body in any suitable way.

A windshield c of drawn steel and having relatively thin walls of substantially uniform thickness covers the forward portion of the cap and acts'toreduce the resistanceof the air to the flightv of the projectile. l/Vithin the rear end ofthe'windshieldlis secured, by any suitable means, such as welding, solderlllO riveting or the like, a metallic ring. d.

The rearend wallsof the windshield and ring are flush, it"being advisable, in order to insure this conditiomto turn these. walls 0E after the ring is secured.

It is also preferred that these end walls shall extend, from the peripheral edge of'the wind shield wall to the internal edge ofthe ring," in a re'arwardly'inclined direction. Tliefcap' b is reduced' in' diameter, at an appropriate distancein front 'ofits r'ea'r'end, in'an amount equallingthecombined thicknesses of'wind- I shield and ring, the shoulder'thus' formed" being preferably inc-lined inward to. afford a self-locking seat fortheringfandthe'rear end of the windshield. r'easonofthis equality of thickness, the peripheries of the rear end ofthe'capand of the abutting rear endof the windshield will be flush, thus pro vidinga continuous outer smooth surface from the rearrend' offthe capto 'the'poin't of thewindshield j The ring (Z and the cap bare provided with interengaging screw threads, as indicated-at 0, whereby thewvindshield with its secured: ring may be screwedas a unit onto and off the p f ,7

The for Y ard directionot"longitudinal ex; 7 tension .of the-windshield and ring is slightly" convergent toward the axis ofthe shell. Itis desirable, although not essential, to make'the ring of'a thicknesswhich gradually increases from front to rear, sothattheinterna'l s'crewf thread on the'ring will be substantiallyparal ticable procedure being to form the windlel with the axis of the shell, the external screw thread on the cap being, of course, also parallel with said axis.

Instead of securing the windshield to the cap, it may be secured, through ring d, direct to the body of the shell, as shown in Fig. 3.

Ring (Z may be secured against rotation to prevent accidentaldisplacement or removal of the windshield by any of the means set forth in the said Cox and Fine patent.

Instead of making the windshield of drawn steel, itmay be stamped and pressed; a pracshield in longitudinal halves and then weld the halves together. It should be understood that a windshield of this character is an equivalent of the drawn steel windshield claimed. It is distinctly preferred, however, to make the windshield of drawn steel.

Having now fully described our invention, what we claim and desire to protect by Letters Patent is 1. A projectile having a circumferential cap covering the point of the body and having a forwardly facing shoulder, in combination with a windshield of drawn steel whose rear end is of substantially no greater thickness than its main body, a ring permanently secured Within the rear end of the windshield, and means for detachably attaching the ring to the cap, the rear end of the windshield as well as the rear end of the ring abutting against said shoulder.

3. A projectile having a circumferential forwardly facing shoulder, in combination with a windshield of drawn steel whose rear end is of substantially no greater thickness than its main body, a ring permanently secured within the rear end of the windshield,

and means for detachably attaching the ring to the projectile, the rear concentric walls of windshield and base ring being flush one with the other, said rear walls and the forwardly facing shoulder sloping from their peripheries rearward toward the axis of the projectile.

4. A projectile having a circumferential forwardly facing shoulder, in combination with a windshield of drawn steel whose rear ing a body of comparatively thin material and a base ring having an internal screw' thread and permanently secured Within the rear end of the windshield, the rear concentric walls of windshield and base ring being flush one with the other to adapt them both to seat together against a shouldered projectile body or cap.

6. A windshield for a projectile, comprising a body of comparatively thin material and a base rlng having an internal screw'thread and permanently secured within the rear end of the windshield, the rear concentric Walls of windshield and base ring being flush one with the other and sloping rearwardly from the outer rear peripheral edge of the windshield inward toward the axis of the projec tile to adapt them to seat against a similarly sloping forwardly facing shoulder on a projectile body or cap.

7. A windshield for a projectile, comprising a body of comparatively thin material and a base ring having an internal screw thread and permanently secured within the rear end of the windshield, the windshield converging from its rear end toward its point and the ring increasing in thickness in a rearward direction, the said internal screw thread extending in a surface substantially concentric with the axis of the windshield.

In testimony of which invention, we have hereunto set our hands at Philadelphia, Pennsylvania, on this 19th day of September,

JOHN L. COX. BERNARD M. FINE.

end is of substantially no greater thickness ward direction and having an interior screw thread engaging an exteriorscrew thread on 

